Spoiler accessory for a vehicle



FIG. 1 is a perspective view of a spoiler accessory for a vehicle showing my new design in position of use, it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a rear view of the spoiler accessory;

FIG. 3 is a top view of the spoiler accessory;

FIG. 4 is a side view of the spoiler accessory;

FIG. 5 is a bottom view of the spoiler accessory; and,

FIG. 6 is a front view of the spoiler accessory. 

The ornamental design for a spoiler accessory for a vehicle, as shown and described. 